Fenton试剂深度处理脱墨浆废水的反应动力学研究

Kinetics of Advanced Treatment of Papermaking Wastewater with Oxidation by Fenton′s Reagent

关键词:  Fenton  造纸废水  COD_Cr去除  深度处理  动力学

Key Words:Fenton  papermaking wastewater  COD_Cr removal  advanced treatment  kinetics

摘要:研究了以Fenton试剂为氧化剂，以聚丙烯酰胺（PAM）为絮凝剂对脱墨浆造纸废水氧化絮凝的深度处理方法，并对其氧化机理及动力学进行了分析。通过一系列单因素实验研究结果表明，Fenton氧化过程中各个影响因素对COD_Cr去除率均有不同的影响，综合比较各个实验结果发现，当体系中FeSO₄投加量为0.5 g/L、n(H₂O₂)∶n(Fe²⁺)=1.5∶1、初始pH值=3.0、反应时间35 min时，氧化絮凝后COD_Cr去除率达到55.1%。以一级反应动力学方程为模型，对研究中氧化过程进行了多因素的动力学分析。通过多元回归分析模拟得到反应速率常数k的表达式为k=0.273［H₂O₂］-0.067［Fe²⁺］0.594。

Abstract:Advanced treatment wastewater from papermaking using deinked pulp as raw material was studied with the oxidation-flocculation method by Fenton′s reagent as oxidant and PAM as flocculant， and the oxidation mechanism and kinetics were analyzed. According to the results from a series of single-factor experiments， it was found that the various influence factors in the oxidation process had different effects on COD_Cr removal efficiency. From the experimental results， a desirable COD_Cr removal rate of 55.1% was obtained after oxidation-flocculation at FeSO₄ dosage 0.5 g/L， molar ratio n(H₂O₂)∶n(Fe²⁺)=1.5∶1， initial pH=3.0 and reaction time t=35 min. A multi-factor kinetic of oxidation process analysis was carried out by using first-order model reaction rate constant k was expressed as k=0.273［H²O²］-0.067［Fe²⁺］0.594 through multiple regression analysis.